Bug Description

In v5.17.0 (#1861), repository_extensions.go lowercases extension names via strings.ToLower in the extensions() function, but extensionsValidForV0 uses mixed-case keys ("worktreeConfig", "partialClone", "preciousObjects"). Since Go map lookups are case-sensitive, the lowercased names never match the allowlist.

Additionally, worktreeConfig is missing from builtinExtensions, so it also fails for repositoryFormatVersion=1 repos via ErrUnknownExtension.

This breaks PlainOpen on any repository using git worktree (which sets extensions.worktreeConfig = true

opening repository: core.repositoryformatversion does not support extension: worktreeconfig

see chainloop-dev/chainloop#2966

go-git Version

v5.17.0

Steps to Reproduce

No response

Additional Information

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